<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/64226>64226</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            llvm-17.0.0-rc1: libcxxabi does not build on macOS 10.12.6
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          debohman
      </td>
    </tr>
</table>

<pre>
    ```
FAILED: libcxxabi/src/CMakeFiles/cxxabi_shared_objects.dir/cxa_handlers.cpp.o 
/tera/tera/debo/Projects/llvm/llvmorg-17.0.0-rc1-build/./bin/clang++ --target=x86_64-apple-darwin16.7.0 -DLIBCXX_BUILDING_LIBCXXABI -D_LIBCPP_BUILDING_LIBRARY -D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER -D_LIBCXXABI_BUILDING_LIBRARY -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/tera/tera/debo/Projects/llvm/llvmorg-17.0.0-rc1/libcxxabi/../libcxx/src -I/tera/tera/debo/Projects/llvm/llvmorg-17.0.0-rc1-build/include/c++/v1 -I/tera/tera/debo/Projects/llvm/llvmorg-17.0.0-rc1/libcxxabi/include -I/usr/local/include -fPIC -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color  -O3 -DNDEBUG -std=c++20 -fPIC -nostdinc++ -fstrict-aliasing -funwind-tables -D_DEBUG -UNDEBUG -Wall -Wextra -Wnewline-eof -Wshadow -Wwrite-strings -Wno-unused-parameter -Wno-long-long -Werror=return-type -Wextra-semi -Wundef -Wunused-template -Wformat-nonliteral -Wno-user-defined-literals -Wno-covered-switch-default -Wno-suggest-override -Wno-error -MD -MT libcxxabi/src/CMakeFiles/cxxabi_shared_objects.dir/cxa_handlers.cpp.o -MF libcxxabi/src/CMakeFiles/cxxabi_shared_objects.dir/cxa_handlers.cpp.o.d -o libcxxabi/src/CMakeFiles/cxxabi_shared_objects.dir/cxa_handlers.cpp.o -c /tera/tera/debo/Projects/llvm/llvmorg-17.0.0-rc1/libcxxabi/src/cxa_handlers.cpp
In file included from /tera/tera/debo/Projects/llvm/llvmorg-17.0.0-rc1/libcxxabi/src/cxa_handlers.cpp:12:
In file included from /tera/tera/debo/Projects/llvm/llvmorg-17.0.0-rc1-build/include/c++/v1/stdexcept:48:
In file included from /tera/tera/debo/Projects/llvm/llvmorg-17.0.0-rc1-build/include/c++/v1/iosfwd:106:
In file included from /tera/tera/debo/Projects/llvm/llvmorg-17.0.0-rc1-build/include/c++/v1/__std_mbstate_t.h:14:
In file included from /tera/tera/debo/Projects/llvm/llvmorg-17.0.0-rc1-build/include/c++/v1/__mbstate_t.h:48:
/usr/include/sys/_types/_mbstate_t.h:31:9: error: unknown type name '__darwin_mbstate_t'
   31 | typedef __darwin_mbstate_t mbstate_t;
      |         ^
1 error generated.

```

The following change allows it to build:

```
diff --git a/libcxx/include/__mbstate_t.h b/libcxx/include/__mbstate_t.h
index 2b9e719b1f2e..c6e50a144dc7 100644
--- a/libcxx/include/__mbstate_t.h
+++ b/libcxx/include/__mbstate_t.h
@@ -42,6 +42,7 @@
 #elif __has_include(<bits/types/mbstate_t.h>)
 #   include <bits/types/mbstate_t.h> // works on most Unixes
 #elif __has_include(<sys/_types/_mbstate_t.h>)
+#   include <machine/_types.h>
 #   include <sys/_types/_mbstate_t.h> // works on Darwin
 #elif !defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS) && __has_include_next(<wchar.h>)
 #   include_next <wchar.h> // fall back to the C standard provider of mbstate_t
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzEV91u2zoSfhr6hqAgUbYUX_hC_msN1EmQpMg5VwIljiRuKdJLUnGyT7-gZMd2mm0LNHsaBJLF-fs4H2dIMmtFrQBmaDJHk-WIda7RZsah0E3L1KjQ_GWGkvDwHy5RmK2zzZfVEsUZlqIon59ZIRBdW1Miul5s2TdYCwkW0fUgy23DDPBcF_-C0tmAC9PLWN4wxSUYG5S7XaDx4B3RtQPDTi-PBdH1rdG9PaJrKZ_aw0ubmkRpEAYhMWVEik5Ijug6QHRdCOXjSKZqROeIzjEhjpkaHIqXz1dJnowJ2-0kEM7MXqgoCdIgxGT5ZTNf_PVXPv-6-bLcXH_Kh-9svsFk2X_c3l4I77K7v89En7P7_Pomv73LPm2z_P7v-4fVNv-8yparu6NW7-1dH_n9w3KRL26u7x-y64d8my3ubu5PgvXN3Tb7fvjLZrs5jW5-J4V-8IzVIHgdGDj-TfevDAlVyo6DZ2hgB9H1U_Sx4A8xBqed9ctO6pLJc1F1u1lgUj0JKwohhXshQkmhwJJGcA4Kk0cwRhsULzlzQJxo4WysU3XHDAdO2BMTkh18KNhj8sik9KrPzjBMHpUmneoscLJjhrXgwGDyuDfCAbHOCFVbTB5LZh35d8e8ZSusFaomlQDJiVDCCSbFf8B4RdHupCiFIxWT0jVGd3Xj7fUTGODE7oUrG8KhYp10Q3il4bmEnSPuZQf9kCJPwriOScKd9nA4SHBA3pHYrq7BOuL9G-FT9zigJqVWT2Cs0GrALIFxPy4UB-WYGwSlY5y07KUA0inb7XbaOOCYVFywWmnrRGlJqaU2GJObGJPl9XI1__oJE-s4ipeHZULDI2fehgtVHou78nBKR5gUzKcNk6pTe6E4cayQYH25HDx-Pbp-SxHsPfcEdOWn1zCu9-9w9D6TShOpVd0_zlaIAdcZdUx5H4lYaAUmj53iUPXv3pmDdieZ82qVNi1zngYpfBnIQ1QLxlMqFHBykBwA_Yj3d6hTmvQAMdkuMdk-fHArJ9v1x3oMOCb6o0GW-AObzYDnbZhhT9soXAkJ-NB1OK6Mbv-B4HEWURRn_y8QP2nmHpfjQ8tBcTa--qNQhLbVnvuUhMkfBZLn1vG8LaxjDnIXNB7T-A9DuoRzRtXrznkyti8-XO47Wv_j0jaOUJxN_enw0AEz3KlvSu8V7nugYi1gRNM8H45dJ3NE0yEmxjiOMEoXvYXvkd8r45NZPH81w7g3O_6hyWoQRQMYXIMCwxzw4DC74Xl5vh2eDw3gSkup934vKRumasDMf1ssHHYaD2l9TdR7rrioKkxILRxm5wepUzIvUo-LX1AaPPvN9RnTYgppNC2iikIQlAlMQhaNx7xMcRSGyXg8KBNCfin-kfL5YU_9dThoHKJxiMmYIrpIMKLz_leKB8GBIERjkMLT2TCbvzq8QvGiEP0iPi6qizW1QnR68oDxsTbwz-x82SC6xnttvlmsFW61dfirEs9gfw7ph-v8hKnP1RtULSsboeDVfLD4H1P4cZzv5rDsK-ENfESjw7kA0as3N5HHzXKVLz5nd9niYXV3j-gUI5ogmlxOOlfw7IaZ78uGmR9lvtfFF5pHnP44igtWfvMl4hrAC2wdU5wZjndGPwkOBuvqrH4vC2fEZzGfxlM2glmUTMMkHUdhOmpmxZSGk6Ji0YQm6YSzIr3iNE2nrJyWbBpNR2JGQxqHKZ3SeByN0yCpimI6vkqjZDKhJZ2gcQgtEzLwPTLQph4JazuYJWNKk5FkBUjbX4Qp9Qf4Xogo9fdiM_M2pOhqi8ahFNbZkxcnnIRB4WyHPr8fY67BYqXd0DT6pcjKm3schUFEg2TUGTlrnNtZ30_6RNbCNV0RlLq97O1kN7R8X5EeoF8y_QT-GwAA___a6xQp">